Electrical measuring instrument



AfMURATORI.

ELECTRICAL MEASURING INSTRUMENT. APPLICATION FILED no.9, 1916.

1,392,199. rmnwdse t'z'z, 1921.

INVENTOR A/fredo Mum farl' Q 7 ATTORNEY UNITED STATES PATENT OFFICE.

ALFREDO MURA oRI, or ROME, ITALY, Assre o To THE BRITIsIrwnsTINGIIoIIsEELECTRIC AND MANUFACTURING COMPANY MITRI A CORPORATION or GREAT BRITAIN;

To all whom it may concemt: I Be it known that I, ALFREDO MURATORI, asubject of the King of. Italy, and a resident of Rome, Italy,.haveinvented a new and useful Improvement in ElectricalMeasuringInstruments, ofwhich the following is a specification.

This invention relates to electric meters and has for its "object toconstruct an improved device which can be applied to a meter of themotor type for the purpose of rendering it suitable for use on systemsWhere the consumer is charged under a differential tariff. V r Accordingto theuinvention a retarding torquemis applied to the meter spindle bymeans of a weight which islcapable of adjustment along'a pivoted arm,the moment of the weight about thepivot determining the torqueabovewhich: themeter begins to register. The torque of'the; meter is pro-vportional to the power used in the consumption circuit and when thistorque exceeds the retarding torque imposed by the weight, the meterwill commence to rotate under the differential action of the twotorques. The meter, therefore, registers'the excess energy consumed onlyat those times when the power used exceeds the predetermined limit.

. The inventionis illustrated in the accompanying drawings, in whichFigure 1 illustrates a portion of a metermechanism, having applied to ita device constructed according to the present invention. Fig. 2 shows apart of Fig. 1 drawn to an enlarged scale, and Fig. 3 is a section onthe line'lII-III ofFig.

Referring now to Fig. 1, the rotaryarmature or disk of the meter isindicated at D, and the meter spindle on which the disk is secured isshown at D. Pis a weight capable of sliding, friction-tight on an arm Lperpendicular to the armL formingtherewith a bell-cranklever pivoted onafixed pivot 0. To th extremity of the arm'L at the point eis attached asilk cord E, the other end of which is connected toa pulley c, which isloosely mountedon the shaft of the meter, but can be alternately drivenand re leased by a device which is more clearly shown in Figs. 2 and3,-andwhich will now be described. I r

The pulley c is provided with a down-- wardly projecting pin 7). Firmlysecured to the meter spindle is a disk D, to which is ELECTRI AI}MEASURING INSTRUMENT.

' specificationortecersratem.i Patented Sept. 27,1921. Application filedDecember 9, @916. Serial No- 136,061.

point of theinclined surface of the "crutch Z,-the other pin, 6, will bein a position to engage the lowest point of said inclined surface. Underthese" circumstances it is evident that the ring' 0 will be oscillatedon the pivots fdur'ing its rotation. m is a spring, the upper extremityof'which is fixed by the collar m on the meter spindle, and which isadapted to exert a slight pressure on-the pulley c, for a purposehereinafter mentioned.

The operation of'the device isasfollows: The weight P is normally in theposition shown in Fig. land the tension in the cord E exerts a torque onthe pulley 0 which is transmitted by the pin 79 to one or other ofthepins b, I), with which it is in engagement to the ring 0 and thencethrough the disk D?;to;the meter spindle. When the meter-is energized ittends to rotate in 'adiconsequently to the amount by-which the powertaken by the customer exceeds the predetermined limit. As the meterrotates, the

pin p and the pulley c are carried around by the horizontal .pin withwhich it is inengagement, 6 for example asshownin Fig. 1, therebythrough the cord E and bell-crank lever Lf, L raising, the weight I. Asthe'ro tation continues the other horizontal pin, b for example, willengage with the helicoidal surface'of the crutch Z" at its lowest pointand is gradually raised by said surface thus oscillating the ring 0 onthe pins 7 until when said pin b, for example, reaches the highest pointof the helicoidal surface,'the other pin, 6 for example, has been movedto such an extent in the downward direction as to release the pin p. Thetorque exerted by the tension in the cord E will then rotate the pulleyc backward and permit the weight P- torque and thus tends to acceleratein speed.

This, however, is compensated for by the shock with which the pin 9strikes the horizontal pin 5 or b when it reengages.

- It, will be observed that during the rotation of the meter the momentof theweight P about the center 0; and consequently the tension in thecord E will'vary, but the angular displacement of the arms L and L beingidentical, their respective horizontal and'vertical projections maintainin all positions the same relative proportions. "The retarding torqueis,-therefore, substantially constant during a complete revolution ofthe motor. The spring m is'provide'd to reduce the shock caused by thedrop ofthe weight P, this spring exerting asmall pressure on the pulley0 so as to produce a braking action during the rotation of said pulleyin the reverse direction bythetensionin the cord E.

The 1 device constructed as herein described is very simple and'caneasily be applied to any ordinary standard type 'o'fmotor meter withoutmodifying the design of the latter. It can easily be adjusted bydisplacing the weight P along the arm L ,'and by graduating the arm Lthe limit of power up towhich the meter does not register can be readilyadjusted without the u'se'of 'another meter and even without connectingthe meter in circuit. The device can also be readily removed from anymeter to which it has been applied and the meter restored to its normalcondition.

" I claim as my invention:

1. In an excess-demand'meter, the combination'with a rotatable member,of a single weighted bell-crank lever, a pulley loosely mounted on therotatable member, means for connecting the lever tothepulley, and meansfor recurrently connecting the pulley to the rotatable. member.

2. The combination wlth an electric meter of the motor'type,of weightedbell-crank portion, of each revolution of the spindlewhen the meter isrotating.

L In an electric meter ofthe motortype, a pulley loosely mounted on themeterspindle, meanswfor exerting a'tangential force on said pulley,'adisk carried by the meter spindle,"aring pivoted to said disk, armsprojecting from said ring, a pin projecting from said pulley, and meanswhereby the pinis caused to" engage with the arms in succession as themeter rotates.

5. In anelectric meter of the motor type,

the combination of a; pulley loosely mounted on the meter spindle, andhavinga pin proj ecting therefrom, means for exerting a tangentialforceon'said pulley, a 'disk carried by the meter spindle-,"a ringpivotedtosaid 1 disk, arms projecting from said ring in a directionperpendicular to the'm'eter axis adaptedfperiodically to engage with thepin projecting from said pulley, *and an arm having an inclined surfaceadapted to engage said former arms in succession as the meter rotates,whereby an oscillation of the ringon itspivotstakesplace: V

6. The combination with an electrici'meter of the motor; type of aweighted bell-crank lever, a fixed pivot therefor, a pulley looselymounted on the meterfspindle and connected to one arm; of the bell-cranklever, and means for braking said pulley. i

a rotatable member, of asingle weighted bell-crank lever, a pulleyloosely mounted on the: rotatable 'member, a flexible means forconnecting the lever to the pulley, and

1 7. In a motor meter, the 'combination with means actuated by therotatable'member for so recurrently; connecting the pulley to therotatablejmember as to cause the'lever to impose a substantiallyconstant average retarding force on the rotatable member.

' In testimony whereof I'have hereunto subscribed my name this sixth d-fN Vember, 1916.

Witnessesz I ERNEST SAL'vA'roRI, I JAG GASTON- ALBRIG HT.

-. ALFREDO M I ATORIQ

